SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss	$ 0.0	$ 0.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	1.2	0.0
Accounts Receivable, Allowance for Credit Loss	$ 1.2	$ 0.0